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Mount Prospect, Illinois 7 Day Weather Forecast
Wx Forecast - Wx Discussion - Wx Aviation
NWS Forecast for Mount Prospect IL
National Weather Service Forecast for: Mount Prospect IL
Issued by: National Weather Service Chicago, IL
Updated: 3:36 pm CDT Apr 19, 2026
 
This
Afternoon
This Afternoon: Isolated showers before 4pm.  Partly sunny, with a high near 48. Northwest wind around 15 mph, with gusts as high as 25 mph.  Chance of precipitation is 20%.
Isolated
Showers

Tonight

Tonight: Widespread frost, mainly after 3am.  Otherwise, mostly clear, with a low around 32. Northwest wind 5 to 10 mph becoming light north  after midnight. Winds could gust as high as 20 mph.
Partly Cloudy
then Frost

Monday

Monday: Widespread frost, mainly before 8am.  Otherwise, sunny, with a high near 53. Light and variable wind becoming south 5 to 10 mph in the morning.
Frost then
Sunny

Monday
Night
Monday Night: Mostly cloudy, with a low around 44. South wind around 10 mph, with gusts as high as 20 mph.
Mostly Cloudy

Tuesday

Tuesday: Mostly sunny, with a high near 73. Southwest wind around 15 mph, with gusts as high as 25 mph.
Mostly Sunny

Tuesday
Night
Tuesday Night: Partly cloudy, with a low around 49.
Partly Cloudy

Wednesday

Wednesday: Sunny, with a high near 71.
Sunny

Wednesday
Night
Wednesday Night: Partly cloudy, with a low around 55.
Partly Cloudy

Thursday

Thursday: Mostly sunny, with a high near 80. Breezy.
Mostly Sunny
then Mostly
Sunny and
Breezy
Hi 48 °F Lo 32 °F Hi 53 °F Lo 44 °F Hi 73 °F Lo 49 °F Hi 71 °F Lo 55 °F Hi 80 °F

Hazardous Weather Outlook
Freeze Warning
 

This Afternoon
 
Isolated showers before 4pm. Partly sunny, with a high near 48. Northwest wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 20%.
Tonight
 
Widespread frost, mainly after 3am. Otherwise, mostly clear, with a low around 32. Northwest wind 5 to 10 mph becoming light north after midnight. Winds could gust as high as 20 mph.
Monday
 
Widespread frost, mainly before 8am. Otherwise, sunny, with a high near 53. Light and variable wind becoming south 5 to 10 mph in the morning.
Monday Night
 
Mostly cloudy, with a low around 44. South wind around 10 mph, with gusts as high as 20 mph.
Tuesday
 
Mostly sunny, with a high near 73. Southwest wind around 15 mph, with gusts as high as 25 mph.
Tuesday Night
 
Partly cloudy, with a low around 49.
Wednesday
 
Sunny, with a high near 71.
Wednesday Night
 
Partly cloudy, with a low around 55.
Thursday
 
Mostly sunny, with a high near 80. Breezy.
Thursday Night
 
Showers likely, mainly after 1am. Mostly cloudy, with a low around 61.
Friday
 
A chance of showers. Mostly cloudy, with a high near 72.
Friday Night
 
A chance of showers. Mostly cloudy, with a low around 48.
Saturday
 
Partly sunny, with a high near 63.

 

Forecast from NOAA-NWS for Mount Prospect IL.

Weather Forecast Discussion
337
FXUS63 KLOT 191955
AFDLOT

Area Forecast Discussion
National Weather Service Chicago/Romeoville, IL
255 PM CDT Sun Apr 19 2026

.KEY MESSAGES...

- Frost/freeze conditions are expected outside of Chicago late
  tonight into Monday morning.

&&

.DISCUSSION...
Issued at 255 PM CDT Sun Apr 19 2026

Convective showers tied to both a sharp mid-level trough and
surface cold front have produced rain, snow, graupel and some
lightning across across northern Illinois over the past couple
hours. The intensity of these showers should continue through
late afternoon as they track southeast before waning with the
loss of daytime heating.

A broad surface high will then edge southeastward over the area
overnight into Monday morning. Beside a low chance for some
shallow lake effect clouds drifting over far northeast Illinois
overnight, mostly clear to clear skies are expected. Very dry
air highlighted by current dew points in the mid teens over
central Wisconsin and PWATs under 0.25 inch combined with
light/calm winds will allow for efficient radiational cooling
tonight. The current Freeze Warning for all but central Cook
County remains on track. Have opted to also include a Frost
Advisory for central Cook County for mainly the near west
suburbs. It is possible that the dry air limits frost
development even with temps in the 32-35F range, but it seems
prudent to include a headline as we are now well into the
growing season.

The high pressure will bring mostly sunny skies, light winds
and high temps in the 50s (40s near the lake) for Monday.
Increasing southwest flow behind the departing ridge will yield
much warmer conditions with highs in the 70s on Tuesday.
However, a backdoor cold front below a small mid-level wave
crossing the area late Tuesday afternoon into the evening may
provide sufficient ascent to generate an axis of showers and
perhaps a few storms. Somewhat limited low-level moisture and
existing capping under the edge of an EML should limit
thunderstorm coverage.

Ridging will build back into the area by Thursday, with another
round of showers and storms, some potentially strong, Thursday
night and Friday.

Kluber

&&

.AVIATION /18Z TAFS THROUGH 00Z TUESDAY/...
Issued at 112 PM CDT Sun Apr 19 2026

Key Messages:

- Scattered showers this afternoon along with gusty west to
  northwest winds.

- Low confidence in the wind direction forecast for ORD and MDW
  tomorrow.


Scattered rain showers are ongoing in the area at the beginning
of the TAF period, though the greater coverage of shower
activity should diminish by 21Z. Isolated instances of graupel
and a rogue lightning strike or two may also occur with this
activity.

Winds will remain gusty and out of the west to northwest through
this afternoon with occasional gusts as high as 30 kts or so
possible. A northeasterly wind shift may occur this evening as a
surface trough pushes inland off of Lake Michigan, but surface
winds at this time may already be quite light. There also
remains a lower-end chance for MVFR ceilings to be observed
tonight after this wind shift occurs, but have maintained VFR
conditions in the TAFs for now.

Tomorrow, a lake breeze is expected to develop and is more
likely than not to stall in close proximity to ORD and MDW.
Thus, confidence in precise wind direction trends at both of
these TAF sites remains low at this time, but wind speeds do
look like they`ll remain at or below 10 kts for the most part
tomorrow.


Ogorek

&&

.LOT WATCHES/WARNINGS/ADVISORIES...
IL...Freeze Warning from midnight tonight to 9 AM CDT Monday for
     ILZ003-ILZ004-ILZ005-ILZ006-ILZ008-ILZ010-ILZ011-ILZ012-
     ILZ013-ILZ019-ILZ020-ILZ021-ILZ023-ILZ032-ILZ033-ILZ039-
     ILZ103-ILZ105-ILZ106-ILZ107-ILZ108.

     Frost Advisory from 2 AM to 9 AM CDT Monday for ILZ104.

IN...Freeze Warning from midnight CDT /1 AM EDT/ tonight to 9 AM
     CDT /10 AM EDT/ Monday for INZ001-INZ002-INZ010-INZ011-
     INZ019.

LM...Small Craft Advisory until 7 PM CDT this evening for the IL
     and IN nearshore waters.

&&

$$

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